Hello Bjarne,
What problems has D solved? (Other than providing compiler writers with masturbatory material). Light bulb (!!!): D is a circle jerk! (Not that there's anything wrong with that).
If you have to ask....OTOH It wouldn't surprise me if there are no problem that D is the first to solve but it is very likely that D is the first to solve them in combination.
-- ... <IXOYE><
